Before anyone goes full autistic rage mode, this was just to see how well it can work. The program got really twisted up on some calculations to where I had to start scrub the data and start over from scratch. However I did want to post the most promising "results" to see what some of our experienced guys think of it.

I can also re-ask it to show the math it used to come to certain numbers, if you guys want to see it.

Also mods, I apologize if this isn't really the best place but since it was a LS7 hypothetical build, based on information of some real parts I have and other information others had.

 

For those interested this is how the AI program cam to the numbers for compression estimation and horsepower estimation:


--- Static Compression Ratio Calculation ---

Formula:
Static CR = (Swept Volume + Clearance Volume) / Clearance Volume

Where:
Swept Volume = (π/4) × Bore² × Stroke
= (3.1416/4) × (4.125)^2 × 4.000
≈ 87.28 in³ ≈ 1430.6 cc

Clearance Volume = Chamber Volume + Gasket Volume + Piston Dish Volume + Deck Volume
= 60 cc (chamber)
+ 6.91 cc (0.051" gasket, 4.100" bore)
+ 7 cc (piston dish)
+ -1.07 cc (piston .005" out of the hole)
≈ 72.84 cc

Static CR = (1430.6 + 72.84) / 72.84
≈ 12.4:1

---

--- Dynamic Compression Ratio Estimation ---

Dynamic CR is affected by Intake Valve Closing (IVC):

Approx IVC = 72° ABDC (installed at 114–116° ICL)
Dynamic CR calculated using online DCR calculator with:
- Bore: 4.125"
- Stroke: 4.000"
- Rod Length: 6.067"
- Static CR: 12.4
- IVC: ~72°
Resulting DCR: ~8.0:1 (safe for 93 octane)

---

--- Estimated Horsepower Calculation (Crank) ---

Formula:
HP ≈ (Peak Flow × Cylinders × VE × RPM × 0.257) / 1000

Values:
Peak Flow = 382 CFM (intake port)
Cylinders = 8
VE = 95% (estimated for your setup)
RPM = 6800 (peak power)
Constant = 0.257


--- Camshaft Timing Derivation (RPM B3) ---

Input Specs:
- Duration @ .050": 243° Intake / 258° Exhaust
- Estimated Advertised Duration: ~280° Intake / ~295° Exhaust
- Lobe Separation Angle (LSA): 114°
- Installed Centerline (ICL): 114°–116°
- Rocker Ratio: 1.8:1
- Valve Lift: .623" / .623"

---

1. Intake Valve Opening (IVO):

Formula:
IVO = ICL - (Advertised Intake Duration / 2)
Assuming:
ICL = 114°, Adv. Duration = 280°
Calculation:
IVO = 114° - 140° = -26° BTDC
Adjusted for real-world ramp:
IVO ≈ ~18° BTDC (used in diagram)

---

2. Intake Valve Closing (IVC):

Formula:
IVC = IVO + Advertised Intake Duration
Using:
IVO = -26°, Adv. Duration = 280°
Calculation:
IVC = -26 + 280 = 254° ATDC
IVC = 254 - 180 = 74° ABDC
Final Used:
IVC ≈ ~72–74° ABDC

---

3. Exhaust Valve Opening (EVO):

Exhaust Centerline = LSA (since cam is nearly symmetrical)
Formula:
EVO = LSA - (Advertised Exhaust Duration / 2)
Using:
LSA = 114°, Adv. Duration = 295°
Calculation:
EVO = 114° - 147.5° = -33.5° BTDC
Convert to crank rotation:
EVO = 180° - 33.5° = 146.5° into cycle = 33.5° BBDC
Adjusted for ramp:
EVO ≈ ~60° BBDC

---

4. Exhaust Valve Closing (EVC):

Formula:
EVC = EVO + Advertised Exhaust Duration
Using:
EVO = 60° BBDC + 295° = 355°
Convert to ATDC:
EVC = 355 - 360 = -5° ATDC ≈ ~10° ATDC (realistic valve closing)
Final Used:
EVC ≈ ~10° ATDC

---

Final Estimated Valve Events:
- IVO: ~18° BTDC
- IVC: ~72–74° ABDC
- EVO: ~60° BBDC
- EVC: ~10° ATDC

These values are typical for a Comp RPM B3 cam installed at 114–116° ICL and reflect real-world opening/closing points accounting for ramp rates.



HP ≈ (382 × 8 × 0.95 × 6800 × 0.257) / 1000
≈ 716.3 bhp (rounded estimate)

Estimated WHP = ~600–620 (assuming 13–15% drivetrain loss)

 

Realized the program somehow in the middle of the calculations replaced the gasket bore of 4.140" with 4.1"

Afterwords it raise the compression to a WHOPPING 12.52:1

Here is the response:

That is the text file trying to figure out why it was off, and then a comparision of it's calculations vs jeepstrokers calculator. The AI when I asked it what the advertised duration was, gave 280, when the cam card I sent to it was 293 for intake. So there might be a memory loss issue with it. However the jeep stroker calculator still gave a higher DCR while using the advertised calculations not the IVC @.050 it kept reading from.

here is a text file of the comparision of it's calculations response:


I guess at this point, the best test would be to have a build that has proven data numbers in real world but not published publicly online.

If anyone has that, and is willing to DM me, please do. This is...interesting.

 

The lift you give on the cam is based on a 1.7x rocker ratio I think the B3 is .660 lift because of the 1.8x rocker ratio.

 

Interesting suggestions. MAF calibration should use ID850 data? 99g for the stainless steel intake valve must assume a hollow stem. 60cc chambers,12.5 CR, no forged pistons, wow.